Hello Simin,
I like how you have explained Embodiment principle whereby Dr. Ray included her image on the video which may distract learner’s attention. This assertion somewhat relates to the Dual Coding theory which states that human takes information using the eyes and the ears which takes images and auditory stimuli respectively. The fact that images and texts are taken in via the visual channel, our attention is easily distracted when the image of a speaker is included in the screen. I also like your explanation of coherence principle. Indeed, people cannot remember everything from a presentation, therefore, it is important to exclude extraneous materials during the presentation. I wonder if you could also include modality principle as one of the principle Dr. Ray failed to follow as she repeatedly mixed texts and images. The modality principle people learn better from graphics and narration rather than graphics and text.
Reference
Mayer, R., & Mayer, R. E. (Eds.). (2005). The Cambridge handbook of multimedia learning. Cambridge university press.
Link: https://nathanyi.opened.ca/2021/01/31/talk-about-multimedia-learning/